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Police told WISN 12 News four or five boys set up a group account on the app Kik, where they kept a cataloged collection of explicit pictures of girls from each of the district's three high schools and two of its middle school.

Police said the girls ranged in age from 10 to 17.

Those involved go to Waukesha North, South and West high schools and Butler and Horning middle schools.

The situation was discovered by a parent, who notified officials at one of the schools.

Officers are working to capture the images that are going around to protect the identity of the minors involved.

Police said they will refer the students to the district attorney's office for possible criminal charges.